<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
<style>
	* {box-sizing:border-box}
body {font-family: Verdana,sans-serif;}
.mySlides {display:none}
/* 幻灯片容器 */
.slideshow-container {
  max-width: 1000px;
  position: relative;
  margin: auto;
}

/* 下一张 & 上一张 按钮 */
.prev, .next {
  cursor: pointer;
  position: absolute;
  top: 50%;
  width: auto;
  margin-top: -22px;
  padding: 16px;
  color: white;
  font-weight: bold;
  font-size: 18px;
  transition: 0.6s ease;
  border-radius: 0 3px 3px 0;
}

/* 定位 "下一张" 按钮靠右 */
.next {
  right: 0;
  border-radius: 3px 0 0 3px;
}

/* On hover, add a black background color with a little bit see-through */
.prev:hover, .next:hover {
  background-color: rgba(0,0,0,0.8);
}

/* 标题文本 */
.text {
  color: #f2f2f2;
  font-size: 15px;
  padding: 8px 12px;
  position: absolute;
  bottom: 8px;
  width: 100%;
  text-align: center;
}

/* 数字文本 (1/3 等) */
.numbertext {
  color: #f2f2f2;
  font-size: 12px;
  padding: 8px 12px;
  position: absolute;
  top: 0;
}

/* 标记符号 */
.dot {
  cursor:pointer;
  height: 13px;
  width: 13px;
  margin: 0 2px;
  background-color: #bbb;
  border-radius: 50%;
  display: inline-block;
  transition: background-color 0.6s ease;
}

.active, .dot:hover {
  background-color: #717171;
}

/* 淡出动画 */
.fade {
  -webkit-animation-name: fade;
  -webkit-animation-duration: 1.5s;
  animation-name: fade;
  animation-duration: 1.5s;
}

@-webkit-keyframes fade {
  from {opacity: .4} 
  to {opacity: 1}
}

@keyframes fade {
  from {opacity: .4} 
  to {opacity: 1}
}
</style>
</head>
<body>
<div class="slideshow-container" id="SlideshowContainer">
  <div class="mySlides fade">
    <div class="numbertext">1 / 3</div>
    <img src="https://c.runoob.com/wp-content/uploads/2017/01/img_mountains_wide.jpg" style="width:100%">
    <div class="text">文本 1</div>
  </div>

  <div class="mySlides fade">
    <div class="numbertext">2 / 3</div>
    <img src="https://c.runoob.com/wp-content/uploads/2017/01/img_fjords_wide.jpg" style="width:100%">
    <div class="text">文本 2</div>
  </div>

  <div class="mySlides fade">
    <div class="numbertext">3 / 3</div>
    <img src="https://c.runoob.com/wp-content/uploads/2017/01/img_nature_wide.jpg" style="width:100%">
    <div class="text">文本 3</div>
  </div>

   <a class="prev" onclick="plusSlides(-1)">❮</a>
  <a class="next" onclick="plusSlides(1)">❯</a>
</div>
<br>

<div style="text-align:center" id="DotContainer">
  <span class="dot" onclick="currentSlide(0)"></span> 
  <span class="dot" onclick="currentSlide(1)"></span> 
  <span class="dot" onclick="currentSlide(2)"></span> 
</div>


<script>
var Index=0;
var SlideshowContainer=document.getElementById("SlideshowContainer");
var mySlides=SlideshowContainer.getElementsByClassName("mySlides");
var DotContainer=document.getElementById("DotContainer");
var dot=DotContainer.getElementsByClassName("dot");
SlideShow(Index);
function plusSlides(n){
    Index += n;	
	if(Index<0){
		Index = mySlides.length-1;
	}
	if(Index>mySlides.length-1){
		Index=0;
	}
	SlideShow(Index)
}
function SlideShow(n){	
	for(var i=0;i<mySlides.length;i++){
		mySlides[i].style.display="none";
	}
	mySlides[n].style.display="block";
		
	for(var i=0;i<dot.length;i++){
		dot[i].className  = "dot";
	}
	dot[n].className  = dot[n].className + " active";
}
function currentSlide(n){
	Index = n
	SlideShow(Index)
}
//第二种
/*var slideIndex = 1;
showSlides(slideIndex);
 
function plusSlides(n) {
  showSlides(slideIndex += n);
}
 
function currentSlide(n) {
  showSlides(slideIndex = n);
}
 
function showSlides(n) {
  var i;
  var slides = document.getElementsByClassName("mySlides");
  var dots = document.getElementsByClassName("dot");
  if (n > slides.length) {slideIndex = 1} 
  if (n < 1) {slideIndex = slides.length}
  for (i = 0; i < slides.length; i++) {
      slides[i].style.display = "none"; 
  }
  for (i = 0; i < dots.length; i++) {
      dots[i].className = dots[i].className.replace(" active", "");
  }
  slides[slideIndex-1].style.display = "block"; 
  dots[slideIndex-1].className += " active";
}*/
</script>

</body>
</html>